gradle: kts dsl (#1845)

* gradle: kts dsl

* deob: Fix tests

* gradle: Convert fernflower plugin to kotlin

injected-client/injected-client.gradle.kts

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2019 ThatGamerBlue
+ * Copyright (c) 2019 Owain van Brakel <https://github.com/Owain94>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -22,28 +23,33 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
-description = 'Injected Client'
 
-compileJava {
-    dependsOn ':injector-plugin:assemble'
-}
+description = "Injected Client"
 
-compileJava.outputs.upToDateWhen { false }
+tasks {
+    compileJava {
+        dependsOn(":injector-plugin:assemble")
 
-compileJava.doLast() {
-    copy {
-        File f = file("build/classes/java/main")
-        f.deleteDir()
-        f.mkdirs()
-        from ("${injectedClassesPath}")
-        into ("build/classes/java/main")
+        outputs.upToDateWhen { false }
+
+        doLast {
+            copy {
+                val f = file ("build/classes/java/main")
+                f.deleteRecursively()
+                f.mkdirs()
+                from(project.extra["injectedClassesPath"])
+                into("build/classes/java/main")
+            }
+        }
     }
-}
 
-classes.doLast() {
-    File f = file("build/classes/java/main/Placeholder.class")
-    f.delete()
-}
+    classes {
+        val f = file("build/classes/java/main/Placeholder.class")
+        f.delete()
+    }
 
-// tasks.build.dependsOn(tasks.decompile)
-// this is just here to show how this could be used
+    // this is just here to show how the fernflower plugin could be used
+    //build {
+    //    dependsOn(project.tasks.getByName("decompile"))
+    //}
+}